Study of an Active Vibration Isolation System

Abstract

Improvements of performance of a vibration isolation table supported by an air-spring are attempted. A servo-control mechanism regulates the air in the air-spring so that the table can always remain immobile in spite of the vibrations of the floor. The principle of this servo-control is as follows. At the instant of upward movement of the table, the air in the air-spring is impelled to flow out. At the instant of downward movement of the table, the air is pushed to flow in.

In this paper, a method of determining an optimal control-signal, which regulates the air in the air-spring, is discussed from a learning control standpoint by a microcomputer. For periodic disturbances, adjustment of control signal for both amplitude and phase is applied. For random disturbances, adjustment of control gain only is applicable.

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